Yaya Mahmout

Diterpenoids from Kyllinga erecta

Abstract 16-Hydroxy-manoyloxide, a new derivative of manoyloxide, ambreinolide and norambreinolide have been isolated from the ethyl acetate extract of Kyllinga erecta rhizomes.

Hydroxymanoyloxides from Kyllinga erecta

Abstract The structures of two diterpenoids, isolated from the rhizomes of Kyllinga erecta have been elucidated as 1β-hydroxymanoyloxide and 11α-hydroxy

Constituents of the Essential Oil of Cyperus maculatus Boëck

Abstract The essential oil of the rhizomes of Cyperus maculatus Boëck was analyzed by GC and GC/MS. Forty components were identified, of which the major component was found to be mustakone (22%).

A new diterpenoid from Kyllinga erecta S

The structure of a diterpenoid isolated from the methylene chloride extract of Kyllinga erecta rhizomes has been elucidated as 11α-hydroxy-13-epi-manoyloxide by spectral analysis (1H, 13C and MS). Deoxygenation of this compound gave the well known 13-epi-manoyloxide. Copyright

In vitro anti-hyperglycaemic effect of glucocapparin isolated from the seeds of Boscia senegalensis (Pers.) Lam. ex Poiret

Glucocapparin (I) used in this study was isolated from the seeds of Boscia senegalensis (family Capparidaceae). The structure of (I) was determined on the basis of an extensive analysis of the spectroscopic data. Brine shrimp lethality bioassay of (I) showed a marked significant cytotoxic activity with LC 50 = 16.482 �g/ml. Compound (I) reduced the liberation of glucose from the liver of rabbits. The active concentration was 30 mg/ml showing that the in vitro anti-hyperglycaemic effect shown could be related to the traditional use of B. senegalensis seeds in Chad against type 2 diabetes.

Fruit Volatiles of Landolphia senegalensis (DC.) Kotschy et Peyr. and L. heudelotii DC. (Apocynaceae)

ABSTRACT The volatile concentrates of the fruits of Landolphia senegalensis (DC.) Kotschy et Peyr. and L. heudelotii DC. were analyzed by GC and GC/MS. More than 90% of the volatiles of L. senegalensis were identified, with linalool (18.0%) and α-terpineol (29.8%) being the major constituents, whereas more than 70% of the volatiles of L. heudelotii were characterized. The major constituents in the volatile concentrate of this latter species were linalool (10.5%) and (E)-β-farnesene (8.8%).